US5752492A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for controlling the air-fuel ratio in an internal combustion engine
Assignee: Toyota Motor Corp
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Filing: 1997-06-18
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Granted: 1998-05-19
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Expires: 2017-06-18
Abstract
Abstract An apparatus for controlling the air-fuel ratio in an internal combustion engine, which quickly responds to a deviation between the actual air-fuel ratio and the target air-fuel ratio in the engine and results in immediate purification of the exhaust gas discharged from the engine.
Inventors
- 👤 Yoshihiko Kato
- 👤 Masahiro Wanibe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 21:21
CPC Classifications
F; F02; F02D; F02D41/00; F02D41/02; F02D41/14; F02D41/1438; F02D41/1477; F02D41/1482; F02D41/1439; F02D41/1441; F02D41/1443; F02D41/24; F02D41/2406; F02D41/2425; F02D41/2429; F02D41/2451; F02D41/2454; F02D41/1444; F02D41/1454; F02D41/1456; F02D41/2464; F02D41/2467
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
152 words
An apparatus for controlling the air-fuel ratio in an internal combustion engine comprising: a linear type air-fuel ratio sensor provided in the exhaust system of the engine; a means for calculating a target fuel supply amount in response to the engine operating condition, the target fuel supply amount being predetermined so that the air-fuel ratio of the mixture supplied to the engine becomes a target air-fuel ratio; a means for correcting learned values, each corresponding to each domain divided into a plurality of sections of the engine operating condition, based on a deviation between an actual air-fuel ratio calculated from the output of the air-fuel ratio sensor and the target air-fuel ratio; and a means for calculating a fuel supply amount to the engine based on the target fuel supply amount and the learned value respectively calculated by the above means and a feedback correction amount calculated in response to the deviation.
Claim 2
Independent Claim
152 words
An apparatus for controlling the air-fuel ratio in an internal combustion engine comprising: a linear type air-fuel ratio sensor provided in the exhaust system of the engine; a means for calculating a target fuel supply amount in response to the engine operating condition, the target fuel supply amount being predetermined so that the air-fuel ratio of the mixture supplied to the engine becomes a target air-fuel ratio; a means for correcting learned values, each corresponding to each domain divided into a plurality of sections of the engine operating condition, based on a deviation between an actual air-fuel ratio calculated from the output of the air-fuel ratio sensor and the target air-fuel ratio; and a means for calculating a fuel supply amount to the engine based on the target fuel supply amount and the learned value respectively calculated by the above means and a feedback correction amount calculated in response to the deviation.
Claim 3
Dependent Claim
113 words
An apparatus according to claim 1, wherein the means for correcting learned values comprises: a means for calculating integral values each obtained by integrating a deviation between an actual air-fuel ratio calculated from the output of the air-fuel ratio sensor and the target air-fuel ratio, each integral value being corresponding to each domain divided into a plurality of sections of the engine operating condition; a storage for storing learned values corresponding to the integral values of the deviations each obtained corresponding to each domain of the engine operating condition; and a means for updating the learned values stored in the storage corresponding to the integral values calculated by the integral value calculating means.
Claim 4
Dependent Claim
25 words
An apparatus according to claim 2 further comprising a means for changing a correcting amount of the learned value in response to the integrated value.
Claim 5
Dependent Claim
88 words
An apparatus according to claim 1, wherein the means for correcting learned values comprises: a means for calculating a feedback correcting amount based on a deviation between the actual air-fuel ratio calculated from the output of the air-fuel ratio sensor and the target air-fuel ratio; a means for calculating a feedback correcting rate of the target fuel amount to the feedback correcting amount; and a means for updating a learned correction factor based on the comparison of the feedback correcting rate and a threshold level of the rate.
Claim 6
Dependent Claim
25 words
An apparatus according to claim 4 further comprising a means for changing a correcting amount of the learned value in response to the integrated value.
Claim 7
Independent Claim
154 words
An apparatus for controlling the air-fuel ratio in an internal combustion engine comprising: a linear type air-fuel ratio sensor provided in the exhaust system of the engine; a means for calculating a target fuel supply amount in response to the engine operating condition, the target fuel supply amount being predetermined so that the air-fuel ratio of the mixture supplied to the engine becomes a target air-fuel ratio; a means for correcting learned values, each corresponding to each domain divided into a plurality of sections of the engine operating condition, based on a deviation between an actual fuel supply amount calculated from the output of the air-fuel ratio sensor and the target fuel supply amount; and a means for calculating a fuel supply amount to the engine based on the target fuel supply amount and the learned value respectively calculated by the above means and a feedback correction amount calculated in response to the deviation.
Claim 8
Independent Claim
154 words
An apparatus for controlling the air-fuel ratio in an internal combustion engine comprising: a linear type air-fuel ratio sensor provided in the exhaust system of the engine; a means for calculating a target fuel supply amount in response to the engine operating condition, the target fuel supply amount being predetermined so that the air-fuel ratio of the mixture supplied to the engine becomes a target air-fuel ratio; a means for correcting learned values, each corresponding to each domain divided into a plurality of sections of the engine operating condition, based on a deviation between an actual fuel supply amount calculated from the output of the air-fuel ratio sensor and the target fuel supply amount; and a means for calculating a fuel supply amount to the engine based on the target fuel supply amount and the learned value respectively calculated by the above means and a feedback correction amount calculated in response to the deviation.
Claim 9
Dependent Claim
116 words
An apparatus according to claim 6, wherein the means for correcting the learned values comprises: a means for calculating integral values each obtained by integrating a deviation between an actual fuel supply amount calculated from the output of the air-fuel ratio sensor and the target fuel supply amount, each integral value being corresponding to each domain divided into a plurality of sections of the engine operating condition; a storage for storing learned values corresponding to the integral values of the deviations each obtained corresponding to each domain of the engine operating condition; and a means for updating the learned values stored in the storage corresponding to the integral values calculated by the integral value calculating means.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2001-05-18 | 2001-11-17 | 2002-05-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-05-18 | 2005-11-17 | 2006-05-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-05-18 | 2009-11-17 | 2010-05-19 | $7700.00 | Window Closed / Lapsed |